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[why] dc->hwss->edp_backlight_control is null, it would casue it only be off main-link of eDP. It is not worng behavior for eDP power sequence off. [how] Must use hwseq->funcs.edp_backlight_control finction pointer for edp backlight. Signed-off-by: Yi-Ling Chen <Yi-Ling.Chen2@amd.com> Reviewed-by: Sung Lee <Sung.Lee@amd.com> Acked-by: Rodrigo Siqueira <Rodrigo.Siqueira@amd.com> Signed-off-by: Alex Deucher <alexander.deucher@amd.com>